library(dplyr);
library(magrittr);
library(ggplot2);
library(lubridate);
library(readr);
df <- read.csv("./marathon_results_2017.csv", header=TRUE, stringsAsFactors=FALSE)
df <- df[c('Age', 'M.F', 'X5K', 'X10K', 'X15K', 'X20K', 'X25K', 'X30K', 'X35K', 'X40K', 'Official.Time')]
df %<>% filter(X5K != '-' & X10K != '-' & X15K != '-' & X20K != '-' & X25K != '-' & X30K != '-' & X35K != '-' & X40K != '-')
df
cols <- c('X5K', 'X10K', 'X15K', 'X20K', 'X25K', 'X30K', 'X35K', 'X40K')
df %<>% mutate_each_(funs(as.POSIXct(., format="%H:%M:%S")), cols);
`mutate_each()` is deprecated.
Use `mutate_all()`, `mutate_at()` or `mutate_if()` instead.
To map `funs` over a selection of variables, use `mutate_at()`
df$X40K <- as.numeric(difftime(df$X40K, df$X35K, units='secs'))
df$X35K <- as.numeric(difftime(df$X35K, df$X30K, units='secs'))
df$X30K <- as.numeric(difftime(df$X30K, df$X25K, units='secs'))
df$X25K <- as.numeric(difftime(df$X25K, df$X20K, units='secs'))
df$X20K <- as.numeric(difftime(df$X20K, df$X15K, units='secs'))
df$X15K <- as.numeric(difftime(df$X15K, df$X10K, units='secs'))
df$X10K <- as.numeric(difftime(df$X10K, df$X5K, units='secs'))
df$X5K <- as.numeric(difftime(df$X5K, as.POSIXct('00:00:00', format="%H:%M:%S"), units='secs'))
colnames(df)[colnames(df) == 'M.F'] <- 'Gender'
df
demo <- df %>%
  mutate(Gender, Gender = ifelse('M' == Gender,'MEN', 'WOMEN')) %>% 
  mutate(Age, Age = ifelse(Age > 40, 'OLD', 'YOUNG')) %>% 
  group_by(Gender, Age) %>% 
  count()
demo$comb <- paste(demo$Age, demo$Gender)
demo
# pie charts in gg plot are just too much work
#library(scales)
#ggplot(demo, aes(x="", y=n, fill=factor(comb)))+
#  geom_bar(width=1, stat="identity") +
#  scale_fill_manual(values=c("#3617ff", "#e048ce", "#45caff", "#ffc4fb")) + 
#  coord_polar("y", start=0) 
# Pie Chart with Percentages
slices <- demo$n
lbls <- demo$comb
pct <- round(slices/sum(slices)*100)
lbls <- paste(lbls, pct) # add percents to labels 
lbls <- paste(lbls,"%",sep="") # ad % to labels 
pie(slices, labels = lbls, col=c("blue", "cyan", "violet", "pink"), main="Distribution of gender and age")

Finishing times by gender

df$Official.Time <- as.POSIXct(df$Official.Time, format="%H:%M:%S")
ggplot(df, aes(df$Official.Time, fill = df$Gender)) +
  geom_histogram(aes(y=..density..), alpha=0.6, 
                 position="identity", lwd=0.2) +
  ggtitle("Normalized")

df %>%
  mutate(Age, Age = ifelse(Age > 40, 'OLD', 'YOUNG')) %>% 
  ggplot(aes(Official.Time, fill = Age)) +
    geom_histogram(aes(y=..density..), alpha=0.6, 
                 position="identity", lwd=0.2) +
  ggtitle("Normalized")

n_groups <- 20
zebra_colormap <- rep(c("darkcyan", "cyan"), 20)
df <- df[df$Official.Time < quantile(df$Official.Time, 0.99), ]
#splits = split(df, cut(df$Official.Time, N))  # Time splits
#splits <- split(df, rep(1:ceiling(nrow(df)/N), each=N, length.out=nrow(df)))  # N marathoners splits
#df$group <- rep(1:ceiling(nrow(df)/n_groups), each=nrow(df)/n_groups, length.out=nrow(df))  # N marathoners splits
df$Official.Time <- as.numeric(difftime(df$Official.Time, as.POSIXct('00:00:00', format="%H:%M:%S"), units='mins'))
df$group <- cut(df$Official.Time, n_groups)
ggplot(df) + 
  geom_point(aes(x=1:NROW(df), y=df$Official.Time,  col=as.factor(df$group))) +
  scale_color_manual(values=zebra_colormap) +
  theme_bw()

Are women more disciplined than men?

women <- df %>%
  filter(Gender == 'F')
men <- df %>%
  filter(Gender == 'M')
b_splits = split(df, df$group)  # Time splits
w_splits = split(women, women$group)  # Time splits
m_splits = split(men, men$group)  # Time splits
g_sd_df <- data.frame("group" = numeric(0),
                      "gender" = character(0),
                      "n" = numeric(0),
                      "mean_sd" = numeric(0),
                      "sd_sd" = numeric(0),
                      stringsAsFactors = FALSE)
for (i in 1:n_groups) {
  gender <- 'M'
  mean_sd <- as.numeric(m_splits[[i]] %>%
                    select(cols) %>%
                    transform(SD=apply(., 1, sd, na.rm = TRUE)) %>%
                    summarize(sample_sd = mean(SD, na.rm = TRUE), sd(SD, na.rm = TRUE)))
  n <- as.numeric(m_splits[[i]] %>%
                    select(Official.Time) %>%
                    summarize(n = n()))
  g_sd_df[nrow(g_sd_df) + 1,] = c(i, gender, n, mean_sd, sd_sd)
  
  
  gender <- 'F'
  mean_sd <- as.numeric(w_splits[[i]] %>%
                    select(cols) %>%
                    transform(SD=apply(., 1, sd, na.rm = TRUE)) %>%
                    summarize(sample_sd = mean(SD, na.rm = TRUE), sd(SD, na.rm = TRUE)))
  n <- as.numeric(w_splits[[i]] %>%
                    select(Official.Time) %>%
                    summarize(n = n()))
  if (n != 0) {
    g_sd_df[nrow(g_sd_df) + 1,] = c(i, gender, n, mean_sd, sd_sd)
  }
  gender <- 'B'
  mean_sd <- as.numeric(b_splits[[i]] %>%
                    select(cols) %>%
                    transform(SD=apply(., 1, sd, na.rm = TRUE)) %>%
                    summarize(sample_sd = mean(SD, na.rm = TRUE)))
  n <- as.numeric(b_splits[[i]] %>%
                    select(Official.Time) %>%
                    summarize(n = n()))
  g_sd_df[nrow(g_sd_df) + 1,] = c(i, gender, n, mean_sd, sd_sd)
  
}
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g_sd_df$n <- as.numeric(g_sd_df$n)
g_sd_df$mean_sd <- as.numeric(g_sd_df$mean_sd)
g_sd_df$sd_sd <- as.numeric(g_sd_df$sd_sd)
g_sd_df$group <- as.numeric(g_sd_df$group)
g_sd_df
ggplot(g_sd_df) +
  geom_point(aes(x=group, y=mean_sd, colour=gender)) +
  scale_color_manual(values=c('black', 'violet', 'blue')) +
  theme_bw()

g_sd_df <- filter(g_sd_df, g_sd_df$gender == 'M' | g_sd_df$gender == 'F')
g_sd_df$error <- (1.96 * g_sd_df$sd_sd) / sqrt(g_sd_df$n) 
g_sd_df
ggplot(g_sd_df, aes(x=group, y=mean_sd, colour=gender)) +
  geom_point() +
  geom_errorbar(aes(ymin=mean_sd - error, ymax=mean_sd + error)) +
  scale_color_manual(values=c('violet', 'blue')) +
  theme_bw()

if (!file.exists('animation.gif')) {
  library(animation)
  n_samples <- 20
  sample <- df %>%
    group_by(group) %>%
    sample_n(n_samples, replace=TRUE)
  
  times <- t(data.matrix(select(sample, cols)))
  
  makeplot <- function() {
    for(i in 1:nrow(sample)) {
    
      plot.ts(times[cols,1:i], 
              plot.type="single", 
              lwd=0.5, 
              col=rep(rainbow(n_groups), each=n_samples), 
              ylim=c(900, 3000), 
              xlab='', ylab='', axes = F)
      
      lines(times[cols,i], 
            lwd=2, col=1, 
            xlab='', ylab='', axes = F)
      
      title(main="5K pace analysis", sub=paste('Group rank #', as.character(ceiling(i/n_samples))), xlab="", ylab="Split time (seconds)")
      axis(side=2,at=c(800, 1000, 1500, 2000, 2500, 3000),labels=c('800', '1000', '1500', '2000', '2500', '3000'))
      axis(side=1,at=c(-10,1,2,3,4,5,6,7,8),labels=c('','5K', '10K', '15K', '20K', '25K', '30K', '35K', '40K'))
    }
  }
  oopt = ani.options(interval = 0, nmax = n_runners)
  saveGIF(makeplot(),interval = 0.1, width = 580, height = 400)
  ani.options(oopt)
}
corr <- df %>%
  select(cols) %>%
  transform(SD=apply(., 1, sd, na.rm = TRUE)) %>%
  select(c('SD')) %>%
  as.data.frame()
corr <- bind_cols(corr, select(df, c('Official.Time')))
ggplot(corr, aes(x=Official.Time, y=SD)) +
  #stat_density_2d(geom = "raster", aes(fill = ..density..), contour = FALSE)
  #stat_density_2d(aes(fill = ..level..), geom = "polygon")
  #stat_density_2d(geom = "point", aes(size = ..density..), n = 20, contour = FALSE)
  geom_hex(binwidth = c(1, 20)) + 
  theme_bw()

NA
---
title: "2017 Boston Marathon Analysis"
output: html_notebook
---

```{r}
library(dplyr);
library(magrittr);
library(ggplot2);
library(lubridate);
library(readr);
```

```{r}
df <- read.csv("./marathon_results_2017.csv", header=TRUE, stringsAsFactors=FALSE)
df <- df[c('Age', 'M.F', 'X5K', 'X10K', 'X15K', 'X20K', 'X25K', 'X30K', 'X35K', 'X40K', 'Official.Time')]
df %<>% filter(X5K != '-' & X10K != '-' & X15K != '-' & X20K != '-' & X25K != '-' & X30K != '-' & X35K != '-' & X40K != '-')
df
```

```{r}
cols <- c('X5K', 'X10K', 'X15K', 'X20K', 'X25K', 'X30K', 'X35K', 'X40K')
df %<>% mutate_each_(funs(as.POSIXct(., format="%H:%M:%S")), cols);

df$X40K <- as.numeric(difftime(df$X40K, df$X35K, units='secs'))
df$X35K <- as.numeric(difftime(df$X35K, df$X30K, units='secs'))
df$X30K <- as.numeric(difftime(df$X30K, df$X25K, units='secs'))
df$X25K <- as.numeric(difftime(df$X25K, df$X20K, units='secs'))
df$X20K <- as.numeric(difftime(df$X20K, df$X15K, units='secs'))
df$X15K <- as.numeric(difftime(df$X15K, df$X10K, units='secs'))
df$X10K <- as.numeric(difftime(df$X10K, df$X5K, units='secs'))
df$X5K <- as.numeric(difftime(df$X5K, as.POSIXct('00:00:00', format="%H:%M:%S"), units='secs'))
colnames(df)[colnames(df) == 'M.F'] <- 'Gender'
df
```


```{r}
demo <- df %>%
  mutate(Gender, Gender = ifelse('M' == Gender,'MEN', 'WOMEN')) %>% 
  mutate(Age, Age = ifelse(Age > 40, 'OLD', 'YOUNG')) %>% 
  group_by(Gender, Age) %>% 
  count()

demo$comb <- paste(demo$Age, demo$Gender)
demo

# pie charts in gg plot are just too much work
#library(scales)
#ggplot(demo, aes(x="", y=n, fill=factor(comb)))+
#  geom_bar(width=1, stat="identity") +
#  scale_fill_manual(values=c("#3617ff", "#e048ce", "#45caff", "#ffc4fb")) + 
#  coord_polar("y", start=0) 
```

```{r}
# Pie Chart with Percentages
slices <- demo$n
lbls <- demo$comb
pct <- round(slices/sum(slices)*100)
lbls <- paste(lbls, pct) # add percents to labels 
lbls <- paste(lbls,"%",sep="") # ad % to labels 
pie(slices, labels = lbls, col=c("blue", "cyan", "violet", "pink"), main="Distribution of gender and age")
```


Finishing times by gender

```{r}
df$Official.Time <- as.POSIXct(df$Official.Time, format="%H:%M:%S")
ggplot(df, aes(df$Official.Time, fill = df$Gender)) +
  geom_histogram(aes(y=..density..), alpha=0.6, 
                 position="identity", lwd=0.2) +
  ggtitle("Normalized")
```


```{r}
df %>%
  mutate(Age, Age = ifelse(Age > 40, 'OLD', 'YOUNG')) %>% 
  ggplot(aes(Official.Time, fill = Age)) +
    geom_histogram(aes(y=..density..), alpha=0.6, 
                 position="identity", lwd=0.2) +
  ggtitle("Normalized")

```



```{r}
n_groups <- 20
zebra_colormap <- rep(c("darkcyan", "cyan"), 20)

df <- df[df$Official.Time < quantile(df$Official.Time, 0.99), ]


#splits = split(df, cut(df$Official.Time, N))  # Time splits
#splits <- split(df, rep(1:ceiling(nrow(df)/N), each=N, length.out=nrow(df)))  # N marathoners splits
#df$group <- rep(1:ceiling(nrow(df)/n_groups), each=nrow(df)/n_groups, length.out=nrow(df))  # N marathoners splits
df$Official.Time <- as.numeric(difftime(df$Official.Time, as.POSIXct('00:00:00', format="%H:%M:%S"), units='mins'))
df$group <- cut(df$Official.Time, n_groups)

ggplot(df) + 
  geom_point(aes(x=1:NROW(df), y=df$Official.Time,  col=as.factor(df$group))) +
  scale_color_manual(values=zebra_colormap) +
  theme_bw()
```



Are women more disciplined than men?
```{r}
women <- df %>%
  filter(Gender == 'F')

men <- df %>%
  filter(Gender == 'M')

b_splits = split(df, df$group)  # Time splits
w_splits = split(women, women$group)  # Time splits
m_splits = split(men, men$group)  # Time splits


g_sd_df <- data.frame("group" = numeric(0),
                      "gender" = character(0),
                      "n" = numeric(0),
                      "mean_sd" = numeric(0),
                      "sd_sd" = numeric(0),
                      stringsAsFactors = FALSE)

for (i in 1:n_groups) {
  gender <- 'M'
  mean_sd <- as.numeric(m_splits[[i]] %>%
                    select(cols) %>%
                    transform(SD=apply(., 1, sd, na.rm = TRUE)) %>%
                    summarize(sample_sd = mean(SD, na.rm = TRUE), sd(SD, na.rm = TRUE)))
  n <- as.numeric(m_splits[[i]] %>%
                    select(Official.Time) %>%
                    summarize(n = n()))
  g_sd_df[nrow(g_sd_df) + 1,] = c(i, gender, n, mean_sd, sd_sd)
  
  
  gender <- 'F'
  mean_sd <- as.numeric(w_splits[[i]] %>%
                    select(cols) %>%
                    transform(SD=apply(., 1, sd, na.rm = TRUE)) %>%
                    summarize(sample_sd = mean(SD, na.rm = TRUE), sd(SD, na.rm = TRUE)))
  n <- as.numeric(w_splits[[i]] %>%
                    select(Official.Time) %>%
                    summarize(n = n()))
  if (n != 0) {
    g_sd_df[nrow(g_sd_df) + 1,] = c(i, gender, n, mean_sd, sd_sd)
  }

  gender <- 'B'
  mean_sd <- as.numeric(b_splits[[i]] %>%
                    select(cols) %>%
                    transform(SD=apply(., 1, sd, na.rm = TRUE)) %>%
                    summarize(sample_sd = mean(SD, na.rm = TRUE)))
  n <- as.numeric(b_splits[[i]] %>%
                    select(Official.Time) %>%
                    summarize(n = n()))
  g_sd_df[nrow(g_sd_df) + 1,] = c(i, gender, n, mean_sd, sd_sd)
  
}


g_sd_df$n <- as.numeric(g_sd_df$n)
g_sd_df$mean_sd <- as.numeric(g_sd_df$mean_sd)
g_sd_df$sd_sd <- as.numeric(g_sd_df$sd_sd)
g_sd_df$group <- as.numeric(g_sd_df$group)
g_sd_df
```


```{r}
ggplot(g_sd_df) +
  geom_point(aes(x=group, y=mean_sd, colour=gender)) +
  scale_color_manual(values=c('black', 'violet', 'blue')) +
  theme_bw()
```

```{r}
g_sd_df <- filter(g_sd_df, g_sd_df$gender == 'M' | g_sd_df$gender == 'F')
g_sd_df$error <- (1.96 * g_sd_df$sd_sd) / sqrt(g_sd_df$n) 
g_sd_df

ggplot(g_sd_df, aes(x=group, y=mean_sd, colour=gender)) +
  geom_point() +
  geom_errorbar(aes(ymin=mean_sd - error, ymax=mean_sd + error)) +
  scale_color_manual(values=c('violet', 'blue')) +
  theme_bw()

```




```{r}
if (!file.exists('animation.gif')) {
  library(animation)

  n_samples <- 20
  sample <- df %>%
    group_by(group) %>%
    sample_n(n_samples, replace=TRUE)
  
  times <- t(data.matrix(select(sample, cols)))
  
  makeplot <- function() {
    for(i in 1:nrow(sample)) {
    
      plot.ts(times[cols,1:i], 
              plot.type="single", 
              lwd=0.5, 
              col=rep(rainbow(n_groups), each=n_samples), 
              ylim=c(900, 3000), 
              xlab='', ylab='', axes = F)
      
      lines(times[cols,i], 
            lwd=2, col=1, 
            xlab='', ylab='', axes = F)
      
      title(main="5K pace analysis", sub=paste('Group rank #', as.character(ceiling(i/n_samples))), xlab="", ylab="Split time (seconds)")
      axis(side=2,at=c(800, 1000, 1500, 2000, 2500, 3000),labels=c('800', '1000', '1500', '2000', '2500', '3000'))
      axis(side=1,at=c(-10,1,2,3,4,5,6,7,8),labels=c('','5K', '10K', '15K', '20K', '25K', '30K', '35K', '40K'))
    }
  }
  oopt = ani.options(interval = 0, nmax = n_runners)
  saveGIF(makeplot(),interval = 0.1, width = 580, height = 400)
  ani.options(oopt)
}
```


![](animation.gif)

 


```{r}
corr <- df %>%
  select(cols) %>%
  transform(SD=apply(., 1, sd, na.rm = TRUE)) %>%
  select(c('SD')) %>%
  as.data.frame()


corr <- bind_cols(corr, select(df, c('Official.Time')))

ggplot(corr, aes(x=Official.Time, y=SD)) +
  #stat_density_2d(geom = "raster", aes(fill = ..density..), contour = FALSE)
  #stat_density_2d(aes(fill = ..level..), geom = "polygon")
  #stat_density_2d(geom = "point", aes(size = ..density..), n = 20, contour = FALSE)
  geom_hex(binwidth = c(1, 20)) + 
  theme_bw()
  
```





